html,
body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft Yahei", sans-serif;
}

* {
    box-sizing: border-box;
}

ul,
li {
    padding: 0;
    margin: 0;
}

li {
    list-style: none;
}

main {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    min-height: 100vh;
    width: 100vw;
    background: #c0c0aa;
    /* fallback for old browsers */
    background: -webkit-linear-gradient( to right, #1cefff, #ebebbd);
    /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient( to right, #1cefff, #ebebbd);
    /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

.card {
    border-radius: 12px;
    min-width: 450px;
    margin: 40px;
    padding: 40px;
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.3);
}

ul li {
    margin: 18px 0;
}

li a {
    display: block;
    color: white;
    text-shadow: 0 0 2px rgba(180, 124, 117, 0.4);
    text-decoration: none;
    text-align: center;
    font-size: 18px;
    padding: 18px;
    border-radius: 12px;
    background: #ffafbd;
    /* fallback for old browsers */
    background: -webkit-linear-gradient( to right, #ffc3a0, #ffafbd);
    /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient( to right, #ffc3a0, #ffafbd);
    /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

@media screen and (max-width: 512px) {
    .card {
        min-width: 350px;
        padding: 4rem;
    }
    li a {
        padding: 1rem;
    }
}